[ALSA] hda-codec - Fix the array over-range access with stac92hd71bxx codec

Add the check of the array range for dac_nids to prevent the over-range
access.
Signed-off-by: NTakashi Iwai <tiwai@suse.de>

sound/pci/hda/patch_sigmatel.c

@@ -2363,7 +2363,7 @@ static int stac92xx_auto_create_multi_out_ctls(struct hda_codec *codec,
 	unsigned int wid_caps, pincap;
 
 
-	for (i = 0; i < cfg->line_outs; i++) {
+	for (i = 0; i < cfg->line_outs && i < spec->multiout.num_dacs; i++) {
 		if (!spec->multiout.dac_nids[i])
 			continue;